Correcting a tax mistake to customer

[fuzzbrett]

I accidentally charged a client tax, when I should have done without tax. How can I correct the charge?

[VanKalkerFarms]

you can refund the difference. 

Find the transaction in your transactions history and select issue refund and choose what to refund.

https://squareup.com/help/us/en/article/5060-refund-overview